Blow-off valve.



PATENTED OUT. 4, 1904.

E w HA V AP o M W PO pm 8 1 7 7 n N UNITED STATES Patented October 4, 1904.

FELIX MCCARTHY, OF POTTSTOVVN, PENNSYLVANIA.

BLOW-OFF VALVE.

SPECIFICATION forming part of Letters Patent No. 771,486, dated October 4, 1904.

Application filed February 18, 1904. Serial Nol94=,248. (No model.)

To ally/7mm, it may concern:

Be it known that I, FELIX MoOAE'rIIY, aciti- Zen of the United States, residing at Pottstown, in the county of Montgomery and State Pennsylvania,have inventedcertain new and of useful Improvements in Blow-Off Valves; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has relation to what are termed blow-off valves; and it consists of certain novel features of construction and combination of parts, the preferred form whereof will be hereinafter set forth, it being understood that I desire to comprehend such substantial equivalents and substitutes of the construction presented as may be regarded as falling fairly within the scope of v proper or the packing-ring carried thereby view of my improved blow-off valve disposed in an open position. Fig. 2 is a similar view showing my valve in a closed position. Fig. 3 is a detail view in perspective of my valve proper, showing a portion of the valve-stem broken away; while Fig. 4 is a plan-sectional view of my valve, taken on line 4 4 of Fig. 1.

In order that the various details of my invention, together with such cooperating accessories as may be deemed necessary to show a practical application thereof to use may be conveniently designated, numerals will be applied thereto, the same numeral referring to the same part in all the views, and, referring in detail to the parts of the drawings, 1 indicates a portion of a boiler to which my blowoif valve is attached substantially in the usual manner, as by bolting the flange 2, carried by the body portion 3 of my valve, directly to the boiler, whereby the opening 4: in the latter will register with the bore of said valve-body. The bore or opening in my valve-body 3 extends entirely through the same, the outer end of said opening being closed by the head 5, said head being secured in position in the usual manner, as by the bolts 6.

The head 5 is also provided with a suitable stuffing-box 7, through which extends the valve-stem 8, preferably forming an integral part of my valve 9, though it is obvious that said stem may be separately attached thereto, if desired. The inner end of the valve-body is provided with the bushing 10, of brass or other non-rusting material, said bushing being designed to fit tightly within the bore of the valve-body and register directly with the opening 4 in the boiler.

It will be observed that the valve 9 is provided with an annular flange 11 at its upper end, said flange fitting snugly in the bore of the body section 3 and is designed to be brought directly in engagement with the packing ring or gasket 12, resting partly upon the shoulder or valve-seat proper, 13, and partly upon the upper beveled edge of the bushing 10, as will be clearly observed by reference to Figs. 1 and 2.

I also form an annular groove or recess 14 in the lower end of the valve proper, 9, in which I dispose a suitable packing to prevent any leakage of steam between the bushing 10 and the valve, as will be obvious.

It will also be observed that the body portion 3 is provided upon one side with the extension or neck 15, terminating in a flange 16, which latter is adapted to be bolted directly to the flange 17 of the discharge-pipe 18, leading to the sewer or other point where the discharge from the boiler is to be conveyed. The valve proper, 9, is provided with an aperture 19 upon that side directly opposite the throat or bore of the neck 15, whereby when the valve is raised or disposed in an open position said aperture will be in direct registration with the bore of the neck and in position to convey the discharge directly into the discharge-pipe 18. When the valve is in an open position, as will be observed by reference to Fig. 1 of the drawings, it will be seen that the flange 11 snugly its the outer end of the bore of the body-section 3, thereby preventing the passage of steam, and consequently relieving the head 5 from all pressure and, in fact, rendering it entirely unnecessary to provide the stuffing-box 7 inasmuch as it will be impossible for but little, if any, discharge to take place between the flange and the walls of the opening in which it is disposed.

It is obvious that in cases where the stuffingbox is to be wholly dispensed with a packingring (not shown) might be provided in the edge of the flange 11.

It will thus be seen that I have accomplished the object of my invention-namely, to prevent contact of the mud, sediment, scales, and other gritty substances carried by the discharging water and steam from coming in contact with the valve-seat, inasmuch as the discharge is passed directly out of the aperture 19 and thence into the discharge-pipe 18, the valve 12 in the meantime being wholly isolated and protected in the manner above set forth.

In order to place the movable part of my improved valve reliably under the control of the operator, I thread the outer end thereof and enter the same into engagement with the threaded bore of the bushing 20, which latter is preferably formed of brass and is rotatably mounted in the cross-head 21, locked in engagement with the outer end of the body'3 of my valve, as by the columns 22 and 23. The bushing 20 is held rotatably in place in its seat in the cross-head 21 by means of the set-screw 24, reaching into an annular groove formed in the outer surface of the bushing, as indicated by the dotted lines 25.

The valve proper, 9, and the valve-stem 8 are held against rotation by the cross-bar or guide 26, the ends of which are properly shaped to fit around a contiguous part of the columns or to extend into vertically-disposed recesses or grooves formed in the inner sides thereof.

Obviously, therefore, my improved blowoff valve may be very quickly opened or closed by simply turning the controlling-wheel 27 in the proper direction.

It may be stated in this connection that the life of a blow-off valve as now commonly constructed and wherein the discharge from the boiler is delivered more or less into direct contact with the valve-seat is comparatively very short, a very limited use necessitating renewal of the packing-rings and other parts, whereas by actual test 1 have demonstrated the great importance and desirability of locating the valve-seat out of the path of the discharge from the boiler, and I therefore have called special attention to the peculiar construction and combination of elements necessary to accomplish this desirable result.

Obviously certain changes in the arrangement of the parts herein described may be made without materially departing from my invention, and believing that the advantages, construction, and manner of using my improved blow-off valve have thus been made clearly apparent further description is dispensed with.

What I claim as new, and desire to secure by Letters Patent, is

1. In a blow-ofl' valve comprising a body portion having a longitudinal bore, a neck upon one side thereof having a bore intersecting said longitudinal bore, a valve-seat in said body portion, a cylindrical bushing fixed within the lower end of said longitudinal bore and open at both ends, the upper end of said bushing being beveled and extending slightly above said valve-seat, a gasket resting upon said valve-seat and beveled edge of said bushing, the extended end of said bushing serving to hold said gasket in place, a longitudinal cylindrical valve adapted to reciprocate within said longitudinal bore, said valve having an opening in one side thereof adapted to register with the bore in said neck when desired, an annular flange at the upper end of said valve adapted to fit snugly in the upper end of said longitudinal bore, a val ve-stem secured to said valve and means at the upper end thereof to raise and lower said valve, said valve also having an annular recess in its lower end adapted to receive suitable packing, whereby a leakage of steam between said valve and bushing will be prevented, all combined substantially as set forth.

2. In a blow-off valve, the combination with the body portion, having a longitudinal bore and a seat formed therein, of a cylindrical valve to fit said bore, a stem extending from the upper end of said valve, means carried by the body portion adapted to cooperate with said stem to raise and lower said valve, said valve having an opening so located that when said valve is at its highest elevation said opening will register with a suitable opening in the side of said body portion and carry the discharging contents entirely above and out of direct contact with said valve-seat, a cylindrical bushing fitting the lower portion of said longitudinal bore and extending from the In testimony whereof Ihave signed my name extreme lower edge thereof up and slightly to this specification in the presence of two subabove the valve-seat, said bushing being open scribing witnesses.

at both ends and having its upper end disposed FELIX MCCARTHY. at an oblique angle whereby a gasket will be Witnesses: securely held in place upon said seat,substan- A. J. BERNHART,

tially as set forth. J. ALLEN HEALY. 

